DTC Advanced Diagnostics: P154B
DTC P154B:Battery Sensor Characteristic Abnormal

General Description

The 12 volt battery sensor is connected between the 12 volt battery and ground. The 12 volt battery sensor measures the 12 volt battery’s current, voltage, and temperature. The measured value is sent to the powertrain control module (PCM) via local interconnect network (LIN) on demand from the PCM. If the PCM receives an invalid value from the 12 volt battery sensor, a DTC is stored.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
5 seconds or more
DTC Type
Two drive cycles, MIL off

Enable Conditions
Condition
 
Vehicle
ON mode
Other
LIN communication is established for at least 3 seconds

Malfunction Threshold
The PCM receives an invalid value from the 12 volt battery sensor for at least 0.5 second.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
12 volt battery sensor internal failure

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.

Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.